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This paper investigates relay selection and subcarrier allocation in cooperative OFDMA systems where users with best-effort (BE) service and rate-constrained (RC) service coexist. We formulate the problem as a binary integer linear programming to maximize the network data rate with quality-of-service (QoS) requirements. A greedy algorithm is proposed for the degradation problem of only BE users and...
In recent years, network virtualization has been introduced to wireless networks due to its great success in wired networks as well as the rapid developing of wireless networks. Resource management is always a key issue in virtualized wireless networks. In this paper, under the resource auction architecture for resource management, we focus on the optimal bidding actions of the service providers (SPs)...
In mobile cloud computing (MCC) systems, the resource in both the cloud and the mobile network should be carefully managed. Cloud resource management and radio resource management have traditionally been addressed separately in previous works. In this paper, we propose to jointly study dynamic cloud and radio resource management so as to improve end-to-end performance of adaptive video transmissions...
The concept of cognitive radio (CR) is proposed to deal with the problem that the spectrum resource is almost used up but some licensed bands are under very low utilization at the same time. In CR networks, secondary users (SUs) are allowed to utilize the licensed spectrum bands by paying to the primary users (PUs) with the spectrum licenses. Besides, with the rapid development of wireless communications...
Cognitive radio (CR) as one of the most promising technologies to solve the problem of exhausting of spectrum resource, draws a lot of attention recently. However, for the highly intelligent wireless devices in the future, the assumption "CR devices introduce no interference to the primary users (PUs)" in traditional CR systems may do not exist anymore, due to that the devices are always...
Spectrum pooling, which allows the secondary networks to utilize the available spectrum bands from different licensed networks, is one of the most promising technologies for dynamic spectrum sharing in cognitive radio systems. Most previous work on spectrum pooling concentrates on the system architecture and the design of flexible access algorithms and schemes. In this paper, a distributed scheme...
This paper considers two hop MIMO-OFDM AF relaying systems with separate power constraint at source and relay. In order to maximize the system capacity, the adaptive transmission is realized by two steps of beamforming with equal power and then power allocation. For the limited feedback scenario, we utilize the Grassmannian beamforming codebooks as the source and relay beamforming codebooks and design...
In dynamic spectrum access systems, such as cognitive radio networks, spectrum pooling is one of the approaches to manage the available spectrum bands from different licensed networks. Based on the concept of spectrum pooling, most previous work focuses on the system architecture and the design of flexible access algorithms and schemes. In this paper, a cooperative and distributed scheme for dynamic...
The resource allocation and limited feedback scheme are proposed in multiuser MIMO OFDM systems. The optimization model is to maximize the throughput with minimal and maximal transmit rate constraint of users, which can effectively guarantees the QoS requirement of multimedia traffics. The resource allocation is divided into user selection and power allocation, realizing the optimization separately...
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